Geometric attachment for pantograph engraving-machines.



W. H. HOPE. GEOMETRI() ATTAGHMBNT ron PANTOGRAPH ENGRAVING MAoHINEs.

APPLIOA'ION FILED SEPT. 23, 1909.

1,005,973. Patented Oct. 17, 1911.

4 Imam WITNESEEE. Y INVENTDR.

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W. H. HOPE.

GEOMETBIOATTACHMENT.PORPANTOGRAYH BNGRAVING MACHINES.

APPLIUATION FILED s112123, 1909.

14,005,973. Patented 001.111,1911.

2 SHBHETSSHEET 2.

f/TH V ^/ITI-1 ES5 5 11min. l: 11111111 INVENTUR APH C0 WASHINGTON n cUNITED sTATEs PATENT oEErcE WILLIAM H. HOPE, 0F PROVIDENCE, RHODEISLAND.

GEOMETRIC ATTACHMENT FOR PANTOGRAPI-I ENGRAVING-MACHINES.

To all whom 'it may concern:

Be it known that I, VVILLTAM H. HOPE, a citizen of the United States,residing at- Providence, in the State of Rhode Island, have invented anew and useful Improvement in Geometric Attachments for PantographEngraving-Machines, of which the following is a specification.

The nature of my invention consists in an attachment for pantographengraving machines, whereby geometrical figures may be readily made andthe use of pantograph engraving machines for this purpose be greatlyextended, such geometric figures having been heretofore made by means ofa geometric lathe, which is a machine of comparatively great cost.

In the accompanying drawings Figure l represents a sectional side viewof a pantograph engraving machine provided with my proposed geometricattachment. Fig. 2 represents an enlarged side View of the saidgeometric attachment. Fig. 3 represents a front view of the same. Fig. 4represents an enlarged section taken in the line 4, 4, of Fig. 2. Fig. 5represents an enlarged section taken in the line 5, 5, of Fig. 2. Fig. 6represents a top view of the pattern plate.

In the accompanying drawing, A represents the lower carriage, B theupper carriage, C the diamond holder, and D the copper roll which is tobe engraved, the construction and arrangement of these parts being thesame as in the ordinary engraving machines for copper rolls, in whichthe roll D `may have a pantographic movement of rotation, while thediamond holder C has the movement of translation.

The horizontal arm E to which my attachment is secured is attached tothe side of the upper carriage, the said attachment consisting of thespindle F held in the bracket G, and provided at its lower end with theslide groove H, in which is held the slide bar I, the said slide barbeing operated back and forth for adjusting the pos sition of the stylusJ by means of the hand operated screw K, which engages with thescrew-threaded.perforation L in the spindle F. The stylus J may thus becaused to move in variable arcs about the axis of the spindle F, asrequired. The stylus J is held in its set position by means of the indexSpecification of Letters Patent.

Application filed September 23, 1909.

Patented Oct. 17, 1911.

serial No. 519,286.

wheel M. The pattern plate N is held upon the upper side of the disk O,the said disk being attached to the upright spindle P, held to turn inthe bracket Q, which is attached to the frame of the machine, the saidspindle being provided at its upper end with the spherical headed pin R,which is loosely held in the socket S, and forced upward by means of thespiral spring T, as shown in Fig. 4s, the spherical head a, of the pinR, being held in the longitudinal groove Z9, which is made in the underside of the slide bar I. The spindle P is supported by means of thecollar U, and is provided with an index wheel V, by means of which theposition of the pattern plate N may be changed as desired.

When one of the tracks ZJ of the pattern plate il, has been traced bythe stylus J, thus forming a corresponding trace upon the waxed surfaceof the roll D, then by turning the index wheel M to cause the outward orinward movement of the stylus, a parallel line will be traced upon thesurface of the roll, and by moving the indeX wheel V, the lines may betraced crossing each other to formA a geometric pattern.

I claim as l`my invention:

l. In a pantograph engraving machine the combination of an upper and alower carriage with an adjustable slide bar pivoted to the uppercarriage for swinging movement in a horizontal plane, a stylus held uponsaid bar, a fulcrum pin for the said bar and a pattern plate for guidingthe movement of the stylus.

2. In a pantograph engraving machine the combination of an upper andlower carriage, with an adjustable slide bar pivoted to the uppercarriage for swinging movement in a horizontal plane, a stylus held uponsaid bar, an upright shaft, a fulcrum pin at the upper end of the saidshaft for the swinging movement of the slide bar, a holding disk securedto the said upright shaft, a pattern plate held upon the said disk,andan index wheel for adjusting the position of the pattern platerelatively to the stylus.

WILLIAM H. HOPE. Witnesses:

SOCRATES SoHoLFrELD, kWALLACE C. PAnsoNs.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

